github.com/bazelbuild/rules_webtesting@v0.2.0/go/wsl/wsl.go (about)

     1  // Copyright 2018 Google Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Package wsl implements the basic server code for WSL (Webdriver Server Light),
    16  // a lightweight replacement for Selenium Server.
    17  package wsl
    18  
    19  import (
    20  	"context"
    21  	"encoding/json"
    22  	"fmt"
    23  	"log"
    24  	"net/http"
    25  	"runtime"
    26  	"time"
    27  
    28  	"github.com/bazelbuild/rules_webtesting/go/httphelper"
    29  	"github.com/bazelbuild/rules_webtesting/go/wsl/hub"
    30  	"github.com/bazelbuild/rules_webtesting/go/wsl/upload"
    31  )
    32  
    33  // Run starts the WSL server.
    34  func Run(localHost string, port int, downloadRoot, uploadRoot string) {
    35  	ctx, cancel := context.WithCancel(context.Background())
    36  	defer cancel()
    37  
    38  	handler := createHandler(hub.New(localHost, &upload.Uploader{Root: uploadRoot}), downloadRoot, cancel)
    39  
    40  	if err := startServer(ctx, port, handler); err != nil {
    41  		log.Print(err)
    42  	}
    43  }
    44  
    45  func startServer(ctx context.Context, port int, handler http.Handler) error {
    46  	server := &http.Server{
    47  		Addr:    fmt.Sprintf(":%d", port),
    48  		Handler: handler,
    49  	}
    50  
    51  	errChan := make(chan error)
    52  
    53  	go func() {
    54  		log.Printf("Listening on %s", server.Addr)
    55  		errChan <- server.ListenAndServe()
    56  		close(errChan)
    57  	}()
    58  
    59  	select {
    60  	case <-ctx.Done():
    61  		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    62  		defer cancel()
    63  		return server.Shutdown(shutdownCtx)
    64  	case err := <-errChan:
    65  		return err
    66  	}
    67  }
    68  
    69  func createHandler(hub http.Handler, downloadRoot string, shutdown func()) http.Handler {
    70  	handler := http.NewServeMux()
    71  
    72  	shutdownFunc := func(w http.ResponseWriter, _ *http.Request) {
    73  		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
    74  		httphelper.SetDefaultResponseHeaders(w.Header())
    75  		w.WriteHeader(http.StatusOK)
    76  
    77  		w.Write([]byte("shutting down"))
    78  		shutdown()
    79  	}
    80  
    81  	handler.HandleFunc("/quitquitquit", shutdownFunc)
    82  
    83  	handler.HandleFunc("/shutdown", shutdownFunc)
    84  
    85  	handler.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
    86  		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
    87  		httphelper.SetDefaultResponseHeaders(w.Header())
    88  		w.WriteHeader(http.StatusOK)
    89  		w.Write([]byte("ok"))
    90  	})
    91  
    92  	handler.Handle("/session", hub)
    93  	handler.Handle("/session/", hub)
    94  
    95  	handler.HandleFunc("/status", func(w http.ResponseWriter, _ *http.Request) {
    96  		w.Header().Set("Content-Type", "application/json; charset=utf-8")
    97  		httphelper.SetDefaultResponseHeaders(w.Header())
    98  		w.WriteHeader(http.StatusOK)
    99  
   100  		respJSON := map[string]interface{}{
   101  			"status": 0,
   102  			"value": map[string]interface{}{
   103  				"build": map[string]interface{}{
   104  					"version":  "unknown",
   105  					"revision": "unknown",
   106  					"time":     "unknown",
   107  				},
   108  				"os": map[string]interface{}{
   109  					"arch":    runtime.GOARCH,
   110  					"name":    runtime.GOOS,
   111  					"version": "unknown",
   112  				},
   113  				"ready":   true,
   114  				"message": "ready to create new sessions",
   115  			},
   116  		}
   117  
   118  		json.NewEncoder(w).Encode(respJSON)
   119  	})
   120  
   121  	handler.Handle("/google/staticfile/", http.StripPrefix("/google/staticfile/", http.FileServer(http.Dir(downloadRoot))))
   122  
   123  	return handler
   124  }